<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">

    <!-- 可选的 Bootstrap 主题文件（一般不用引入） -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap-theme.min.css" integrity="sha384-6pzBo3FDv/PJ8r2KRkGHifhEocL+1X2rVCTTkUfGk7/0pbek5mMa1upzvWbrUbOZ" crossorigin="anonymous">

    <!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script>
    <title>登录</title>
</head>
<body>
    <form action="login" >
        <div class="row">
            <div class="col-xs-6 col-md-offset-4">
                <h1>登录</h1>
            </div>
        </div>
        <div class="row">
            <div class="col-md-4 col-md-offset-4">
                <label>用户名</label>
                <input type="text" class="form-control" placeholder="请输入用户名" name="userName">
            </div>
        </div>
        <div class="row">
            <div class="col-md-4 col-md-offset-4">
                <label>密码</label>
                <input type="password" placeholder="请输入密码"  class="form-control" name="userPassword">
            </div>
        </div>
        <div class="row">
            <button type="submit" class="btn btn-success col-md-offset-7">登录</button>
        </div>
    </form>
</body>
</html>